Pulverizing machine



June 17, 1930. B. A. O'NEILL PULVERIZING MACHINE Filed-Sept. 28, 1925 2 Sheets-Sheet l acumen June 17, 1930. B. A. ONEILL PULVERIZING MACHINE Filed Sept. 28, 1923 2 Sheets-Sheet 2 WWW Patented June 17, 1930 V UNITED. STATES PATENT: OFFICE.

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MINNEAPOLIS, MINNESOTA, ASSIGNOR TO SGH'O'TZ-ONEILL GOIPAINY,- 0]! MINNEAPOLIS, uINNEsoTA, 'A CORPORATION OF MINNESOTA- IPULVERIZING MACHINE Application filed September 28, 1928. Serial No. 665,386.

My invention relates to machines for reducing various solid or fibrous material in a coarse o'r lumpy condition, to a fine impalpable pulver or powder and is an improvement on machines shown and disclosed in Letters Patents No. 619,353, and 619,354, granted February 14, 1899 and No. 1,081,860 granted February 23, 1912.

The present invention relates more particularly to machines for pulverizing fuel products, such as coal, coke, tar pitch, ,or lignite or other similar substances, and tlfe generalobject of the invention is to provide a machine capable of delivering the pulverized fuel, thoroughly and uniformly mixed with the required amount of air for efficient combustion, directly from the machine, into the combustion chamber of steam boilers, metallurgical furnaces, kilns and other heat using apparatus without storing and subsequent handling of the fuel.

More specific ob ects of the invention are to provide a machirie wherein the air used for separating the fine and: coarse fuel within the pulverizing chamber, is directly used for com ustion by being delivered, mixed-with powdered fuel into the combustion chamber,

and wherein auxiliary means are provided for admitting additional air to the fuel and air mixture from the pulverizing chamber before the combined mixture is inducted into the combustion chamber.

A further object is to provide means in the machine for controlling the passage of separating air through the pulverizing chamber for the purpose of regulating thefineness of the powdered fuel and independent means for controlling the auxiliary amount of air required for efficient combustion.

Other objects'are to provide a machine of .the class described, in which the mixing and delivering mechanism. is. accessibly mounted upon the outer end of the main pulverizing shaft or axis at the discharge end of the pulverizingchamber, making the pulverizing chamber easily accessible, and to, provide means whereby this mechanism may be ad'- justed to deliver the combustible mixture in any desired direction radial to the axis.

Means are also provided for automaticallyejecting foreign, non-reducible substances from the pulverizing chamber to prevent injury to the machine.

To these ends my invention consists in cer- 1-1 ofFigure 2, of a maand the relative position of the fan to the" pulverizing chamber. 7

Figure 3 is a vertical cross section on the line 3+3 of Figure 1 on a larger scale, illustrating the method of adjusting the fuel mixture outlet from the machine to varying positions and angles.

Figure 4 is a section on the line 4-4 of Figure 5, illustrating the air control and the method of ejecting metallic or other ungrindable substance from the pulverizing chamber. Figure 5 is a section on the line 55 of Figure 4 Figure Referring to Figs. 1 and 2 of the dra ings, 10 is the base of the machine provid d' and 19, preferably of the in which the main pulverizing shaft 14 is journaled. This shaft is shown provided with a driving pulley 16, but is preferably extended beyond the bearing with bearings 11 ball bearing type,

11 as indicated by dotted linesin Figure 2- and driven by direct connection with a motor 6 is a side elevation of the feeder.

not shown. The casing 17 enclosing the pulverizing chamber 18, is mounted on the forward end of the base 10 and is preferably secured thereto by screws 19. The feeder 20 is shown arranged on top of the casing 17, and is provided with a hopper 22. into which the coal or other fuel may be delivered by 'a v,

spout 23 or other suitable devices for the purpose. The fuel fills the downwardly projecting hopper outlet 24 and normallyrests on a feed plate 26, that is capable of a variable reciprocating or vibrative movement. A stationary bar 27 prevents the fuel particles from moving with the feed plate and as the plate is reciprocated the fuel pieces drop from opposite ends of the plate into the inlet chute 28 and through the opening 30 into the pulverizing chamber 18. The vibrations of the feed plate 26 are induced by a crank pin 31 (Figure 6) connected to a disc 32 on a shaft 33. This shaft is driven from the main shaft 14 by a belt 34 over a pulley 36 arranged on a shaft 37 and driving the shaft 33 through bevel gears 38 and 39. It will be noted that the shaft 14 at one end projects a'considerable distance beyond the bearing 11 to allow 7 the mechanisms supported'by this projectmg end to be removed whenever desired without disturbing the bearings of the shaft on the base.

The feed plate is provided with upwardly extending rocker arms 40 and 42, having projecting shafts 43 and 44 arranged in bearings 45. The arm 40 is keyed to the shaft 43 which extends through its bearing and carries on its outer end an arm 46, to which is pivoted a link 48 at 49. A lever 50, havin a curved slot or recess 51, is pivoted to the eeder casing 20 at 21 and when this lever is in the position shown in Figure 6, the center of curvature for the recess 51 corresponds to the pivot point 49 of the link 48. A segmental slide 54 is fitted to move in the recess 51 and is provided with a pin 55 to which the lower end of the link is pivoted and to which is also pivotally connected a connecting rod 56 journaled to the crank pin 31. As will be seen when the shaft 33 is rotated the curved slide 54 will be given a reciprocating movement in the recess 51 and when the lever 50 is In a position as in Figure 1, the center of curvature for the recess 51 will be thrown to; one side of the pivot point 49 of the link 48 and the reciprocating movement of the slide 54 will result in a rocking movement of the shaft 43 and a vibrating movement of the feed plate 26.

When, however, the lever is adjusted as in Figure 6, no vibration of the feed plate will be induced from the movement of the curved slide 54, as the link 48 will-then swing from the center of curvature of-the recess 51. The stroke of the feed plate'can' thus be adjusted to any desired degree from zero to maximum by moving the lever 50 and the curved recess ably as shown, by a screw 57 threaded in a lug of the lever and adapted to be screwed tightly against a quadrant 58 by means of a hand wheel 59. Thus by gaging and adjusting the leveri50 any desired amount of fuel from zero to maximum may be fed to the pulverizing chamber 18 of the machine for powdering and subsequent induction into a combustion chamber after being mixed with air in the proper proportion.

The powdering mechanism in the chamber 18 comprises a hard metal, circular shell 60 corru ated internally and arranged in the chamEer concentric to the main shaft 14, a pair of circular, hard metal flat rings 61 and 63, corrugated radially and arranged in the front wall 25 of the chamber and a series of beaters 64 secured at intervals around.

the outer edges of high speed rotating circular discs 66, spaced and secured to the main shaft 14 by splinedcollars 67 and 68 and a clamping nut 69 threaded on the shaft 14. The construction and operation of the pulverizing and feed mechanisms are substantially identical with that shown and described in my patents of record, except for a few details hereinafter described. recess 29 (F i s. 4 and 5) is formed in th'efront wall 25 of t e pulverizin chamber 18, preferably at a point spaced ra ially some distance away from the lower wall of the inlet chute 28 in the direction of disc rotation as shown in Figure 5. The upper edge 72' of the recess is preferably arranged at an angle to the radial line 4-4. The recess has an opening through the casing 74, fastened by screws 76, normally closes this opening.

17 and a removable cover The first of the circular beater discs 66 is through the opening 30, they are caught by,

the crushing lugs 77 on the revolving discs 65, which crush the fuel pieces against the corrugated surface of the rings 61 and 63 and reduce these to small sizes. If ametallic or other unbreakable substance should enter through the openin 30, it will be caught by the projecting rotating plates 77 and will be thrown outwards and upwards opposite the recess and will be forced by the lugs 77 and beaters 64 into the recess as indicated in Figures 4 and 5, from whence they may be removed by the operator by taking off the cover. It has been found that metallic substances, if

permitted to enter the pulverizing chamber,

will not be caught in the narrow space between the beaters and corrugated,

: the rotating heaters and acting on the rotatlugs 82 and pins 83 in any suita "now shown in nu side.

on the overhan is the mixture delivering blower or fan 91 of the discs and the corrugated shell, and may be automatically ejected through an openin 79 in the casing 17- as indicated partlcular y in Figure 4.

The most essential novel features of the invention are, however, the fuel mixture controlling and delivering mechanism, which will now be described.

Referrin again to Figures 1 and 2, a suction cham er 80, preferably formed of a cone member 81 as shown in Figure 1, is removably secured to the casing means of le manner detail. The cone member 81 is an annular external flange 84, upon which is mounted a scroll-formed fuel mixing casing 85, having a central circular air inlet port 86, on its outer side a tangential mixture discharge 87 on its periphery and an opening to the suction chamber 80 on the in- An internal annular flange 88 ad- 'oins the external flange 84 of the cone memer 81. Clamping plates 89 are secured by screws 90 to' the internal flange 88 of the blower casing 85 and project over the external flange 84 of the member 81. loosenprovided with B ing these screws, the casing 85 may lie swung around to any position to ada t it to direct its outlet in any desired directlon for different varieties of combustion chambers and may then be clamped in the desiredposition tightening the screws 90.

' within the blower casing 85, and mounted g end 15 of the shaft 14,

having fan blades 92'. In the feed chute 28 are arranged the air inlet openings 93 (Figs. 2 and 5) for the admittance of separating air to the pulverizing chamber 18. These air inlets are controlled b circular disc valves 94, having threaded hu s mounted on threaded rods 95, fast to cross bars 96 preferably cast integral with the casing. By turning one or both; of these valves in either one or the other direction, the opening for the admission'of air to the pulverizing chamber may bevaried to control the strength of the air current pass ing through the pulverizing chamber caused by the vacuum in the suction chamber 80 in-' duced by the rotating fan asindicated by arrows in Fi res 2 and 4.

As the fee er tiallyair tight, the air passed b the valves controls the strength of the si eways pull toward the'fan on the fuel in the pulverizing.

chamber. The centrifugal force induced by ing fuel articles opposes this sideways pull and 0 course greatest on the heavier fuel particles. The finest powdered fuel particles,

proportional to the strength of the air cur-' a rent, Wlll therefore be drawn toward and into.

the fan casing through the suction chamber 80. The fuel fed'to the pulverizing chamber from tlpe feeder, is adjusted for the heat reness of mitted to the blower,

.auxiliary air to ,tral to the axis ing 20 in operation, is substan as the air admitted to thepulverizing chamher is adjusted to produce the required fine ulverized fuel it is generally insuf! ficient or eflicient combustion of the fuel. The necessary auxiliary air is therefore adthrough the outer inlet port 86. r

The admittance of air through this port to the fan is controlled by a disc valve 97, threaded upon a stationary stud 98, fastened in a rib 99 of the casing. The construction and operation of this valve is similar to the valves94 and auxiliary air may be admitted to the mixin fan casing to any required amount for e cient complete combustion by adjusting this valve. The entrance of the of the blower and equal in quantity around the periphery of the disc valve at all adjustments. This air control construction thereby insures a uniform thorough mixture and discharge of the combustion mixture by the rotating fan blades under all adjusted conditions.

I claim as my invention:

1. A grinding mill comprising a base having bearings thereon, a shaft mounted in said bearings and having an end extending outwardly therefrom, a fan mounted on the extended end of said shaft, a housing for said fan having an air trunk and mounted for rotary adjustment to change the position of said trunk with respect to said fan, an internal annular flan e' on the fan housing an external annular ange on the housing of the grlnders, one lapping the other, and a releasable clamping ring ing to its adjustment, grinders mounted on said shaft between said fan and bearings, a

the mixing chamber is cenfor holding the fan houshousing for said grinders and a feed hoppertherefor said fan and grinders being removable-from said shaft without disturbing its bearings.

2. In a grinding mill, a base, a shaftjournaled inbearings at two points thereon and having an end projecting beyond one of said bearings, grinders mounted on.v said projectend, a fan mounted on said projecting end outside of the grinding-chamber adjacent to said grinders and operative to draw air and the'material to be ground through 7 said grinders, and a scroll shaped housing for said fan having aperipherally located tan gentially disposed discharge trunk and separable from the grinding-chamber, saidfan and grinders being detachable from the shaft without disturbing the bearings of the shaft.

'3. In a grinding mill, a grinding chamber having a corrugated inside-facing at the inlet for material into the chamber, a chute for conducting material to the chamber inlet, a rotatable shaft carrying beater-disks, the disk next to the chamber inlet being formed with face-plates for-breaking-up material as fplates an at 

